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Common problem
Common-problem
Effect of temperature on PE pipe production
PE pipe is now are used in construction and family decoration into a pipe, PE pipe is actually use PVC material processed into the pipe, and used in the process of machining method and process to a great extent, will affect its quality, and the choice of raw material, temperature, screw speed, drawing speed and so on, in the process of processing will affect the quality of PE pipes. Among these factors, temperature is the main factor affecting PE pipe production.
PE pipe is a special polyethylene as raw material through the plastic extruder extrusion molding, applied to the township water supply network, irrigation diversion project and agricultural irrigation project, especially suitable for acid and alkali resistance, corrosion resistance environment of plastic pipe. Because PE pipe adopts hot-melt and electric hot-melt connection, the integration of interface and pipe material is completed, and the annular stress and axial impact stress of resistance to pressure can be useful. PE pipe does not add heavy metal salt stabilizer, raw materials are non-toxic, do not scale, do not multiply bacteria, and avoid secondary pollution of drinking water. Therefore, if the temperature is too low, the plasticization is not good, the temperature is too high, the material is easy to differentiate. Temperature control should be based on the original formula, extruder and head layout, screw speed and other factors. And after the completion of production, PE pipe material accumulation can not be too kneaded, not exposed to the sun, otherwise it will also be due to oxidation induction PE plastic pipe raw materials change.
In addition, the low temperature impact resistance of the PE pipe is very good, polyethylene of low temperature brittle temperature is extremely low, can be in - 60-60 ℃ temperature range safety use, winter construction, good impact resistance, due to material pipe is not going to happen, but don't think that PE pipe heat resistance to 60 ° and treating it as a hot water pipe, it is very wrong, long-term overload under any material is the physical change will happen, and PE water supply pipe under the condition of high temperature pressure ability relative to 20 ℃ under pressure can have a very big change, that is to say, PE pipe pressure ability with the sharp decline in the rise of temperature, Therefore, backfilling must be carried out in accordance with the requirements of the national construction code to avoid the impact of the environment (especially the high temperature weather) on the temperature inside the pipe, so as to ensure the smooth progress of the project acceptance, and at the same time, the pressure test shall be carried out in strict accordance with the temperature reduction calculation when pressing the acceptance. So as far as safety is concerned, it's better to try to have 20% of the space in various applications.
